Three New Chalcones from the Aerial Parts of Angelica keiskei

Three new chalcones, 3′‐carboxymethyl‐4,2′‐dihydroxy‐4′‐methoxychalcone ( 1 ), (±)‐4,2′,4′‐trihydroxy‐3′‐[(3‐hydroxy‐2,2‐dimethyl‐6‐methylenecyclohexyl)methyl]chalcone ( 2 ), and 2′′‐hydroxyangelichalcone ( 3 ), were isolated from the aerial parts of Angelica keiskei (Umbelliferae) together with five known compounds, artocarmitin A ( 4 ), (+)‐ cis ‐(3′ R ,4′ R )‐methylkhellactone ( 5 ), (−)‐ trans ‐(3′ R ,4′ S )‐methylkhellactone ( 6 ), 3,4‐dihydroxanthotoxin ( 7 ), and ( Z )‐ p ‐coumaryl alcohol ( 8 ). The known compounds 4  –  8 were identified from A .  keiskei for the first time. The structures of 1  –  3 were elucidated by interpreting spectroscopic data including 1D‐ and 2D‐NMR.